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Plant Structures

Week 3:. Plant Structures. Key (6pts) Create a dichotomous key for these shapes: circle, rectangle, hexagon, triangle Leaf Morphology (4pts) 1. This type of leaf has several blades per axillary bud. (simple/compound)

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Plant Structures

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  1. Week 3: Plant Structures

  2. Key (6pts) Create a dichotomous key for these shapes: circle, rectangle, hexagon, triangle Leaf Morphology (4pts) 1. This type of leaf has several blades per axillary bud. (simple/compound) 2. The space between nodes is described as this. (alternate/internode/opposite) 3. This term describes leaf margins that are smooth. (serrate/lobed/entire) 4. This type of venation has a hand-like pattern. (pinnate/palmate) Tuesday Quiz

  3. Key (6pts) Create a dichotomous key for the following shapes: ellipse, triangle, rectangle, octagon Leaf Morphology (4pts) This type of leaf has one blade per axillary bud. (simple/compound) This term describes feather-like venation patterns. (palmate/pinnate) In terms of leaf attachment to a branch, this term describes nodes that are offset. (whorled/alternate/opposite) Wednesday quiz

  4. Did you know? Only 4-10% of career success is based on IQ. Thought for the day

  5. Stems and Leaves Roots The vascular tissue system Big Idea: Identify gross anatomy of plant structures. OUTLINE

  6. Stems and Leaves • Plant body is divided into two parts: root system and shoot system. • The shoot system contains: stems, leaves, and flowers. • Stems: alternating system of nodes (where leaves are attached). • Leaves: primary photosynthetic organ

  7. Stems: • Many unique characteristics can be used to identify deciduous species in the winter. • Can determine age and leaf arrangement easily • Buds are also key in identification Stems and Leaves

  8. Stems: • Herbaceous Eudicots: • Vascular tissue develop in discreet bundles forming a ring at the stem periphery • Xylem and Phloem separated by fascicular cambium within the bundles • Separated by the interfascicular cambium between the bundles. Stems and Leaves

  9. Stems: • Herbaceous Eudicots: Stems and Leaves

  10. Stems: • Monocotyledons: • Vascular tissue also in discreet bundles, but are either arranged in many rings or randomly scattered in the ground tissue. Stems and Leaves

  11. Stems: • Monocotyledons: Stems and Leaves

  12. Stems: • Morphology • Terminal bud • Leaf scar • Bundle scars • Node • Internode • Axillary bud • Lenticels • Bud scale scar. Stems and Leaves

  13. Monocot vsDicot

  14. Stems and leaves • Leaf Morphology • Lamina: the blade (or leaf) • Petiole (attaches leaf to stem) or basal sheath (if sessile= without a stalk) • Simple or compound • Venation patterns (pinnate or palmate) • Axillary buds (present at nodes)

  15. Stems and Leaves Simple vs. Compound Leaves

  16. Stems and leaves

  17. Stems and leaves

  18. Stems and leaves • 3 Tissue systems: • Dermal (general function-protection) • Vascular (xylem and phloem, transport and support) • Ground (photosynthesis, storage, and support)

  19. Stems and leaves • Modified Leaves: • Spines: reduce water loss and help protect • Tendrils: support and attachment • Prickles and thorns: protection

  20. Stems and leaves • Modified Stems: • Stems normally grow above the ground but can be modified for diverse functions. • Vegetative propagation to food storage • Types of modified stems: tubers, stolons, rhizomes, and bulbs

  21. Primary Root: Gymnosperms and Eudicots Taproot gives rise to lateral roots Roots

  22. Primary Root: Monocots Adventitious roots Roots

  23. Root Hairs absorb water and minerals • Roots have large cortex (ground tissue) for storage of starch and other compounds • The endodermis with casparian strip (impermeable to water) make it necessary for any substance entering the vascular system to enter via the endodermal protoplasts • Center of the cylinder is filled with primary xylem, while the primary phloem is found between the ridges of xylem Roots

  24. Roots

  25. Roots

  26. Xylem and Phloem: • Xylem: Carries water up the plant, which is facilitated via transpiration • Phloem: Food conducting plant tissue The Vascular Tissue System

  27. The Vascular Tissue System

  28. Identify all of the structures from your laboratory manual on the plants and slides in the laboratory • Pg 36, 40, 42, 44, 46, 47, 48, 50, 52, 61, 63, 66 • Make detailed pictures and notes Exercises

  29. Complete web assignment 2 Study for our next quiz, today’s material and pages 71-80 in the text. Print off web assignment 3 (if available) Assignment

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